Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability
There is a buffer overflow vulnerability in the Link Layer Discovery Protocol (LLDP) subsystem of Cisco IOS Software, Cisco IOS XE Software, and Cisco IOS XR Software which could allow an unauthenticated, adjacent attacker to cause a denial of service (DoS) condition or execute arbitrary code.
- Vendor
- Cisco
- Product
- IOS, XR, and XE Software
- CVSS
- 8.8
- EPSS (exploit probability)
- 3.4%
- Status
- kev
- CISA patch-by (BOD 22-01)
- Added to KEV
Is CVE-2018-0167 being exploited?
Yes. CISA added CVE-2018-0167 to its Known Exploited Vulnerabilities catalog on . CISA only lists a CVE when it has reliable evidence of exploitation in the wild.
FIRST's EPSS model puts the probability of exploitation activity in the next 30 days at 3.4% (scored October 14, 2026).
- CISA KEV[ LISTED ]
- ENISA EUVD (exploited)[ — ]
- CIRCL KEV[ — ]
Catalog snapshot 2026-11-13. Full cross-catalog view: /kev-comparison
CVE-2018-0167 timeline
Every event links to its source. Catalog dates are each catalog's own; day offsets count from NVD publication. Data: JSON
What to do
CISA required actionApply updates per vendor instructions.
US federal civilian agencies must remediate by (14 days after listing) under BOD 22-01. Everyone else: that deadline is a sensible upper bound, not a target. Vendor guidance and the NVD record are linked under Source above.
Other Cisco IOS, IOS XR, and IOS XE CVEs we track
| CVE / Vulnerability | Severity | CVSS | EPSS | Added to KEV |
|---|---|---|---|---|
| CVE-2016-6415 Cisco IOS, IOS XR, and IOS XE IKEv1 Information Disclosure Vulnerability | [ HIGH ] | 7.5 | 87.7% | |
| CVE-2018-0175 Cisco IOS, XR, and XE Software Buffer Overflow Vulnerability | [ HIGH ] | 8.0 | 3.5% |